Original Article

Lipoprotein lipase expression level influences tissue clearance of chylomicron retinyl ester

Correspondence to: William S. Blaner

Approximately 25% of postprandial retinoid is cleared from the circulation by extrahepatic tissues. Little is known about physiologic factors important to this uptake. We hypothesized that lipoprotein lipase (LpL) contributes to extrahepatic clearance of chylomicron vitamin A. To investigate this, [³H]retinyl ester-containing rat mesenteric chylomicrons were injected intravenously into induced mutant mice and nutritionally manipulated rats. The tissue sites of uptake of ³H label by wild type mice and LpL-null mice overexpressing human LpL in muscle indicate that LpL expression does influence accumulation of chylomicron retinoid. Skeletal muscle from mice overexpressing human LpL accumulated 1.7- to 2.4-fold more ³H label than wild type. Moreover, heart tissue from mice overexpresssing human LpL, but lacking mouse LpL, accumulated less than half of the ³H-label taken up by wild type heart. Fasting and heparin injection, two factors that increase LpL activity in skeletal muscle, increased uptake of chylomicron [³H] retinoid by rat skeletal muscle. Using [³H]retinyl palmitate and its non-hydrolyzable analog retinyl [¹⁴C]hexadecyl ether incorporated into Intralipid emulsions, the importance of retinyl ester hydrolysis in this process was assessed. We observed that ³H label was taken up to a greater extent than ¹⁴C label by rat skeletal muscle, suggesting that retinoid uptake requires hydrolysis.

In summary, for each of our experiments, the level of lipoprotein lipase expression in skeletal muscle, heart, and/or adipose tissue influenced the amount of [³H]retinoid taken up from chylomicrons and/or their remnants.—van Bennekum, A. M., Y. Kako, P. H. Weinstock, E. H. Harrison, R. J. Deckelbaum, I. J. Goldberg, and W. S. Blaner. Lipoprotein lipase expression level influences tissue clearance of chylomicron retinyl ester. J. Lipid Res. 1999. 40: 565–574.

Supplementary key words: vitamin A, retinoids, postprandial lipids, lipase, transgenic mice, lipid emulsions

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